My friend and I both got an ego twist set with two batteries. We both use the Provari but just thought we would like something smaller for out and about. We liked them well enough but the 1000 mah battery only lasted us about 6 hours on a charge and the 650mah lasted us around 3 hours.I know that's not a bad charge time but we r used to using panisonics in our Provari's which last me 2 days and her 4 days and figured out we r just spoiled and hated the frequent charging of the twists. My friends dad uses 808s and we ended up giving the twists to him. He has had them for about 3 weeks and two of the 4 have now stopped working. One broke in his pocket and the wires came off (we are gonna try and solder it) and the other just stopped charging. One of the 1000 mah batteries has a sticking button so you have to pay close attention when using it or it will keep firing. Her dad now loves variable voltage and she is going to have to buy him a Provari. We have to wonder how long the other two batts will last him after this experience. The cost of 4 twist batteries and a charger would have nearly bought the Provari he will be getting now. If I can help someone new my advice would be if you are in this for the long haul get a well known reliable mod and skip the Ego's. They were a huge let down for us. I will add that they are real branded Joytech Egos. I will also add that her dad is not very active at nearly 80 yrs old and did not drop the batts.